Sorry to hear about the stress.
As others have said, you need to clarify the parents mortgage thing, and get your spouse on board. Money issues cause a lot of marriages to have trouble, and sounds like his head is in the sand with this. That said, if my spouse was paying her parents mortgage I might be like - feic that , if she can do that I can have a few cinnamon lattes....
I'm guess there's some deal where you pay their mortgage, get them out of a hole, and then some day the house will be yours? That could be when you're in your 60s. You need to sort this out way before that. I would say you need to talk to someone about your finances, make a plan, keep a spending diary.
Put the €5,000 on your debt. Maybe €4,000 and keep €1,000 for emergencies. And stop using the credit card.